[Elecraft] Re: AGC adjustment

[Brendan Minish]

At 22:51 29/04/2003 -0700, k6se@juno.com wrote:

>With the original value of 51k at R1, there was a slight change in noise
>when switching AGC ON/OFF (louder noise with AGC OFF).  When I changed R1
>to 42k, the noise change was more noticeable (and the S-meter became more
>sensitive).  When I changed R1 to 33k, the noise change became greater
>(and the S-meter became more sensitive than my MP's S-meter)


In My K2 (Ser 1642) I also had a fixed resistor so I added a junk box 
trimmer to make the circuit the same as the current 'production' K2

I then adjusted it for the ACG action I preferred, I didn't measure the 
voltage so I can't tell you what it was.

Once I finished fiddling I re-calibrated the S-meter using CAL S LO and CAL 
S HI. using these settings I can make the S-meter behave pretty much any 
way I want so I don't really understand your problem with the S-meter.

you WILL have to redo S-meter calibration if you alter the AGC threshold 
adjustment and by playing with the  CAL S LO and CAL S HI values you should 
be able to set it up pretty much any way you like.

After 'calibration' my S meter broadly agrees with the one on my 756PRO2 
however Like many I rarely pay the S-meter any attention and give out 
reports based on how it sounds to me at the time.

73
Brendan EI6IZ